The infection is caused by Cyclospora cayetanesis, an intestinal parasite, according to the FSIS. Signs of Cyclospora infection include diarrhea, loss of appetite, weight loss, stomach cramps or pain, nausea, fatigue and flu-like symptoms, according to the Centers for Disease Control and Prevention.

Caito Foods discovered the issue when their lettuce supplier, Fresh Express, sent notification that the chopped romaine used in some of their salads and wraps was being recalled, according to the FSIS. The affected items were distributed nationwide to stores including Trader Joe's, Kroger and Walgreen's.

The potentially affected items were produced between July 15-18, with a "best by," "enjoy by," "best if sold by" or "sell by" date ranging from July 18-23, according to the FSIS. The products will also include the establishment number “EST. 39985 or P-39985” near the USDA mark of inspection.

The distributor is working with the FSIS to remove the products from stores, according to the alert. A full list of products, labels, code numbers and identifying information can be found at fsis.usda.gov.

"Illnesses might not have been reported yet due to the time it takes between when a person becomes ill and when the illness is reported," the alert reads. "For Cyclospora infections this could take up to six weeks."

The FSIS urges consumers who have purchased these products to throw them away or return them to the place of purchase.

This is the second such incident in as many months for the Central Indiana food distributor. The company was also believed to be tied to asalmonella outbreaktied to precut melon products last month that led to illnesses in five states, including Indiana.

The FSIS encourages anyone concerned about an illness to contact their health-care provider.